Glass fiber optic cable

The fiber-optic cable is used for transmitting signals with
the help of electromagnetic waves in the optical frequency range.
Fiber-optic cables are recommended as an alternative to copper cables
wherever there is severe electromagnetic interference, the
equipotential bonding is to be saved, in open-air systems or where no
electromagnetic radiation is wanted.

To construct optical network structures, glass fiber optic cables are
used for longer paths, while plastic fiber optic cables are used for
shorter paths. These plastic cables use light-conducting plastics such
as polymer optic fiber (POF) or polymer cladded fiber (PCF).